OK, let's crack this. We're given 790 and our task is to multiply it by 7. Essentially, we'll be adding 790 to itself 7 times.
Step 1: 0 + 790 = 790
Step 2: 790 + 790 = 1580
Step 3: 1580 + 790 = 2370
Step 4: 2370 + 790 = 3160
Step 5: 3160 + 790 = 3950
Step 6: 3950 + 790 = 4740
Step 7: 4740 + 790 = 5530

So, 790*7 = 5530